Perhaps you should try some spelling variations:
sach tham » sach nha
canh ngon » danh ngon
tham che » tham chi, thuat che, nham cheo
tu sach » thu sach, su sach, te sach
che khi » chet khit, che khoa, chat khi
tu canh » thu canh, tu chanh, tu can
ngon co » nguon coi, ngon keo, ngon doc

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: (( tu sach tham che khi đong luc ) OR ( tu canh ngon co khi đong luc ))~.
• Adding a wildcard symbol may retrieve word variants: (( tu sach tham che khi đong luc ) or ( tu canh ngon co khi đong luc ))*.